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A is twice as good as workman as B and therefore able to finish a piece of work in 30 days less than B. In how many days can they complete the whole work together? 
A) 20 days
B) 40 days
C) 60 days
D) 80 days
Correct Answer : 20 days Explanation : Let A takes X days to complete the work and B takes 2X days thus ,A take 30 days to complete the work and B takes 60 days 
16 workers working 6 hours day can build a wall of length 150m, breadth 20m, and height 12m in 25 days. In how many days 12 workers, working 8 hours a day will build a wall of length 800m, breadth 15m and height 6m? 
A) 50 days
B) 25 days
C) 25 days
D) 60 days
Correct Answer : 50 days Explanation : to build a wall of 150*20*12=36000 ,hours required = 16*6*25=2400 
A can do a piece of work in 10 days while B can do the same work in 20 days. They start together but A leaves after three days. How many days will B take to complete the remaining work? 
A) 14 days
B) 8 days
C) 12 days
D) 11 days
Correct Answer : 11 days Explanation : One day's work of A and B = (1/10 + 1/20) = 3/20 Work done by A and B together in the 3 days = 3 (1/10 + 1/20) = 9/20 1/20 Work done by B in a day 
If 3 men or 4 women can reap a field in 30 days, how long will 3 men and 6 women take to reap it? 
A) 21 days
B) 16 days
C) 18 days
D) 12 days
Correct Answer : 12 days Explanation : 3 men can complete work in 30 days Thus, 3 men and 6 women will work in a day => 3/(3*30) + 6/(4*30) 3 men and 6 women do 1/12th part of work in a day,so they will complete the work in 12 days 

A is twice as good a workman as B, and finishes the work in 14 days less than B. In how many days can it be done by A alone? 
A) 14
B) 21
C) 28
D) 42
Correct Answer : 14 Explanation : let A take X days to complete the work and B takes 2X days thus ,A take 14 days to complete the work and B takes 28 days. 
30 persons can do a piece of work in 24 days. How many more people are required to complete the work in 20 days? 
A) 4
B) 5
C) 6
D) 10
Correct Answer : 6 Explanation : let X persons required to complete the work in 20 days thus ,num of persons, X = 720 / 20 => 36 extra ,more people required = 36  30 = 6 persons 
A is twice as good workman as B. Together, they finish the work in 14 days. In how many days can it be finish by B separately? 
A) 21
B) 48
C) 42
D) 35
Correct Answer : 42 Explanation : let A take X days to complete the work and B takes 2X days Thus , 

A can do a piece of work in 30 days while B can do it in 40 days. In how many days can A and B working together do it ? 
A) 70 days
B) 171/4 days
C) 190/7 days
D) 120/7 days
Correct Answer : 120/7 days Explanation : If X can do a piece of work in n days, then X's 1 day's work =1/n 
A can do a piece of work in 20 days which B can do in 12 days. B worked at it for 9 days. A can finish the remaining work in ? 
A) 3 days
B) 5 days
C) 7 days
D) 11 days
Correct Answer : 5 days Explanation : If X can do a piece of work in n days, then X's 1 day's work =1/n 
A and B together can do a work in 8 days. If A alone can do it in 12 days, then in how many days can B alone do it? 
A) 12 days
B) 20 days
C) 24 days
D) 28 days
Correct Answer : 24 days Explanation : If X can do a piece of work in n days, then X's 1 day's work =1/n Then ,B alone can complete = (12 * 8) / (12  8) = 96/4 = 24 days 
A can do a piece of work in 12 days. B is 60% more efficient than A. The number of days, it take B to do the same piece of work is ? 
A) 15/2
B) 25/4
C) 8
D) 6
Correct Answer : 15/2 Explanation : A's 1 day's work = 1/12 
X is 4 times more efficient than Y, in what proportion will the number of days taken by X and Y to complete any work? 
A) 8 : 1
B) 1 : 5
C) 6 : 8
D) 5 : 1
Correct Answer : 1 : 5 Explanation : If A is twice as good a workman as B, then: Efficiency (X : Y) = 5 : 1 